Don't be alarmed, he told WPC and took out a shotgun

This is the moment when David Bradley strolled into a police station before confessing: 'I have killed four members of my family.'

Captured on CCTV, he can be seen placing his rucksack on the front desk ready to reveal a huge cache of weapons inside.

Bradley arrived at the Westgate Road police station in Newcastle upon Tyne at around 6am on July 9 last year, having left a scene of unimaginable horror behind him.

Cameras recorded him walking past a row of shops, wearing a black jacket, jeans, white trainers and a black baseball cap, with his rucksack slung casually over his right shoulder.

Despite having just gunned down four people without compunction, Bradley respects the 'no smoking' sign outside the police station and pauses to stub out his cigarette before entering.

He then puts his rucksack on the counter and presses a buzzer to summon a policewoman, who is told by Bradley: "Don't be alarmed" before he takes a 12-bore pump-action shotgun out of the bag.

Fearing for her safety, the officer runs for back-up as Bradley paces around the foyer with his hands on top of his head, then takes the weapon used in the killings out of his waistband and puts it on the counter.

After Bradley goes outside to have another cigarette, he is approached by PC Andy Ritchie, who asks him: "Are you all right, mate?"

"No, not really," Bradley replies.

"Why, what's up?" asks the PC. "I have killed four members of my family."

Without any fuss, Bradley stands up, his arms outstretched, and is searched by the constable who arrests him on suspicion of murder and handcuffs him.

Bradley gives the officer the address where the bodies will be found.

The items he took to the police station included a loaded 7.65mm CZ selfloading pistol and silencer, two knives, 119 shotgun cartridges, 18 bullet cartridges of 7.65mm calibre, 96 9mm cartridges and more than 200 .22 cartridges.

Bradley had also made an improvised nail bomb using an Army Thunderflash explosive device with nails packed around it.

Armed police arrived 90 minutes later at Bradley's home, where they discovered his aunt, uncle and two cousins, all shot in the head.